问题
选择题
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting. [ ]
A. that
B. it
C. this
D. him
答案
答案：B
搜题请搜索小程序“爱下问搜题”
The chairman thought _____ necessary to invite Professor Smith to speak at the meeting. [ ]
A. that
B. it
C. this
D. him
答案：B
如表所列各组物质中，不能通过一步反应实现如图所示转化的是
| 物质 选项 | a | b | c |
| A | AlCl3 | Al（OH）3 | NaAlO2 |
| B | HNO3 | NO | NO2 |
| C | Si | SiO2 | Na2SiO3 |
| D | Fe | FeCl2 | FeCl3 |
A．A
B．B
C．C
D．D
